[Webkit-unassigned] [Bug 239506] New: Fix accelerated compositing for null ScrollingCoordinator and overflow scroll in LayerAncestorClippingStack.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239506

            Bug ID: 239506
           Summary: Fix accelerated compositing for null
                    ScrollingCoordinator and overflow scroll in
                    LayerAncestorClippingStack.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jigen.zhou at sony.com
                CC: simon.fraser at apple.com

With null ScrollingCoordinator and overflow scroll, a crash can occur in LayerAncestorClippingStack::updateWithClipData in the following code block:

        if (existingEntry.clipData.isOverflowScroll && !clipDataEntry.isOverflowScroll) {
            ASSERT(scrollingCoordinator);
            scrollingCoordinator->unparentChildrenAndDestroyNode(existingEntry.overflowScrollProxyNodeID);
            existingEntry.overflowScrollProxyNodeID = 0;
        }

(https://github.com/WebKit/WebKit/blob/main/Source/WebCore/rendering/LayerAncestorClippingStack.cpp#L137)

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